If you zoom in on the front tire you can see the Ready Lift UCA. My guess is it is the 2" SST which has 2" in the front and adds another 1" in the back with a 3" replacing the stock 2" block. I say that because the back looks higher to me. Or it could just be the Ready LIft 1.75" leveling kit.
Did you get the 5100s put on the back? Do you happen to have a side shot? I have a black sierra with the 2" factory lift and want to get my nose up. Thinking about the 6112s and 5100 combo.